Default delta
=============

Checking the current status of datagrepper, we realized that not specifying a `delta`
value in the URL led to timeouts while specifying one, makes datagrepper return
properly.

Investigating the configuration options of datagrepper, we found out that there is a
`DEFAULT_QUERY_DELTA` configuration key that allows to specify a default delta value
when one is not specified.

Just setting that configuration key to ``60*60*24*3`` (ie: 3 days) improves the
datagrepper performances quite a bit (as in queries actually return instead of timing
out).

That configuration change, does break the API a little bit as with it, it will limit the
messages returned to the last 3 days.